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If the fish were mostly OK at the start, but the problem started around the 21st, I wonder if you added any decoration or something dropped in the tank which might be toxic to the fish around the 20th? There must be something in the tank which raises the pH, and there might be something in the...

Tropical tank.

From left to right: - Red Peacock - Yellow Tail Acei - Electric Yellow (Labidochromis Caeruleus) - Red Forest Jewel (it’s not a Malawi) - Another Electric Yellow - Pearl of Likoma (Melanochromis Joanjohnsonae)

Thanks for the warm welcome. Cichlid tank below, photo taken a few days ago. The plants in the tank are practically weeds, they are in clay pots and double in length every 4 – 5 weeks. The filter is a Fluval U3. The substrate is sand at the rear and shell at the front to raise the pH from 6.6...

I’m returning to the hobby after many, many decades. Currently I have a 130 litre cichlid tank (mostly Malawi) and a 200L tropical tank. Hoping to set up a tank for the Blue Rams at some stage, haven’t been able to keep them for longer than 5 – 6 months in the community tank.